Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

Can you find the mistake in the below statement?

There is a place where if I stand up straight, I will still be considered sideways.

What is the word or phrase below?
R | E | A | D

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Which is faster, Heat or Cold ? Explain.

How many times in a given day, minutes and hour clock comes in a straight line ?

What is the centre of gravity?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?